Temporomandibular dysfunction , myofascial , craniomandibular and cervical pain : effect on masticatory activity during rest and mandibular isometry

Abstract

BACKGROUND AND OBJECTIVES: Craniomandibular and cervical symptoms interfere with mandibular stability. Determining whether these disorders influence muscle activation when chewing, it is possible to improve interventions for this population. The objective of this study was to verify the effect of the temporomandibular joint dysfunction, craniomandibular and cervical pain on the electromyographic activity of the masticatory muscles during rest and mandibular isometry. METHODS: Fifty-five women aged between 18 and 30 years were divided into two groups: with temporomandibular dysfunction (n=28) and without temporomandibular dysfunction (n=27). The diagnosis of temporomandibular dysfunction was established using the Research Diagnostic Criteria for Temporomandibular Disorder (RDC/TMD). The RDC was also used to determine the presence of craniomandibular pain. Cervical pain was defined by physical examination. The electromyographic activity of masseter and temporalis muscles was evaluated in the rest position and mandibular isometry. The amplitude of muscle activation was represented by the root mean square values (RMS%) and normalized by maximum voluntary contraction. The Mann-Whitney U test was used to detect differences between the groups with and without temporomandibular dysfunction; with and without myofascial craniomandibular pain; and with and without cervical myofascial pain. RESULTS: It was observed greater amplitude in the activation of masseter and right temporalis muscles in the rest position in individuals with myofascial craniomandibular pain compared to asymptomatic (p<0.05). There was no difference among individuals with and without cervical myofascial pain, and with and without temporomandibular dysfunction. CONCLUSION: The presence of myofascial craniomandibular pain did not affect the masticatory activity, with greater muscle activation in mandibular rest. Temporomandibular dysfunction, myofascial, craniomandibular and cervical pain: effect on masticatory activity during rest and mandibular isometry Disfunção temporomandibular, dor miofascial crâniomandibular e cervical: efeito na atividade mastigatória durante o repouso e isometria mandibular Carlos Eduardo Fassicollo1, Maylli Daiani Graciosa1, Barbara Flissak Graefling1, Lilian Gerdi Kittel Ries1 1. Universidade do Estado de Santa Catarina, Florianópolis, SC, Brasil. Submitted in March 09, 2017. Accepted for publication in August 04, 2017. Conflict of interests: none – Sponsoring sources: none. Correspondence to: Rua Paschoal Simone, 385, Coqueiros 88080-350 Florianópolis, SC, Brasil. E-mail: maygraciosa@gmail.com © Sociedade Brasileira para o Estudo da Dor